Though Mars spans only half Earth's diameter, the absence of oceans means its solid surface rivals the combined area of all Earth's continents — a quiet reminder that size and usable terrain are not the same measure. This counterintuitive fact reshapes how scientists and planners envision the Red Planet, not as a cramped and barren marble, but as a world of continental scale. As humanity looks outward, understanding Martian geography becomes less an academic exercise and more a practical foundation for what may one day be our second home.